More about space junk

There are a lot of junk just floating around space. Broken satellites, destroyed rocket bodies, human waste, and a glove that was left behind by astronaut ED White during his spacewalk in 1965. I think that it is cool how many random things are floating around space. But I wonder how all that trash got in space. Did it fall out of a satellite or something? Did it float away from someone? Maybe you can help me by answering those questions if you know the answers!